@@ -356,11 +356,11 @@
  * @brief Increases the retain count.
  *
  * Each time an object is released, the retain count gets decreased and the
  * object deallocated if it reaches 0.
  */
-- retain;
+- (instancetype)retain;
 
 /*!
  * @brief Returns the retain count.
  *
  * @return The retain count
@@ -379,18 +379,18 @@
  * @brief Adds the object to the topmost OFAutoreleasePool of the thread's
  *	  autorelease pool stack.
  *
  * @return The object
  */
-- autorelease;
+- (instancetype)autorelease;
 
 /*!
  * @brief Returns the receiver.
  *
  * @return The receiver
  */
-- self;
+- (instancetype)self;
 
 /*!
  * @brief Returns whether the object is a proxy object.
  *
  * @return A boolean whether the object is a proxy object
@@ -469,17 +469,17 @@
  * This method will never return `nil`, instead, it will throw an
  * @ref OFAllocFailedException.
  *
  * @return The allocated object
  */
-+ alloc;
++ (instancetype)alloc;
 
 /*!
  * @brief Allocates memory for a new instance and calls @ref init on it.
  * @return An allocated and initialized object
  */
-+ new;
++ (instancetype)new;
 
 /*!
  * @brief Returns the class.
  *
  * @return The class
@@ -624,11 +624,11 @@
  * This method exists so that classes can be used in collections requiring
  * conformance to the OFCopying protocol.
  *
  * @return The class of the object
  */
-+ copy;
++ (id)copy;
 
 /*!
  * @brief Initializes an already allocated object.
  *
  * Derived classes may override this, but need to do
@@ -639,11 +639,11 @@
  * `nil`, instead an exception (for example @ref
  * OFInitializationFailedException) should be thrown.
  *
  * @return An initialized object
  */
-- init;
+- (instancetype)init;
 
 /*!
  * @brief Returns the method signature for the specified selector.
  *
  * @param selector The selector for which the method signature should be
@@ -1116,11 +1116,11 @@
  * copy. If only a mutable version of the class exists, it creates a mutable
  * copy.
  *
  * @return A copy of the object
  */
-- copy;
+- (id)copy;
 @end
 
 /*!
  * @protocol OFMutableCopying OFObject.h ObjFW/OFObject.h
  *
@@ -1133,11 +1133,11 @@
 /*!
  * @brief Creates a mutable copy of the object.
  *
  * @return A mutable copy of the object
  */
-- mutableCopy;
+- (id)mutableCopy;
 @end
 
 /*!
  * @protocol OFComparing OFObject.h ObjFW/OFObject.h
  *